Circular sawing machine



N6 Model.) 3` Sheets-,f-Sheet 1.

W. E. DOANB & C+. W. BUGBBE.

CIRCULAR. sAWING-MAGH-INE. 110.311,421. u 'Patented Jan.. 27, 1885.

(No Model.) @ets-Sheet 2.

. s sh W. H. DOANE & G.- W. BUGBBE. GIRGULAR SAWING MACHINE.

` Nuo. 311,421. Patented Jan'. 27, 1885.

(No Model.) I 3 Sheets-Sheet 3.

' W. H'. DOAN-E REG. W. BUGBEB.

GIRGULAP.A SAWING MACHINE. N0. 311,421. atented 18.11.27, 1885.

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WILLIAM H. DOANE AND GEORGE W. BUGBEE, OF CINCINNATI, OHIO.

CIRCULAR SAWINGv MACHINE.

SPECIFICATION forming part of Letters Patent No. 311,421, dated January27, 1885.

Application tiled September 6, 1884. (No model.)

To al@ whom, it may concern:

Beit known that we, WILLIAM H. DOANE and GEORGE W. BUGBEE, citizens ofthe United States, residing at Cincinnati, in the county of Hamilton andState of Ohio, have invented certain new and useful Improvements in Saw-Mills; and we do hereby declare the following to be a full, clear, andexact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same.

Our invention consists of certain novel features of organization, whichWillnbe specific'- ally pointed out in the claims at the close of thisspecification.

IVe illustrate our invention as applied to a circular-saw mill the sawof which is mounted on a reciprocating carriage. One of the novelfeatures provides for advancing the saw-carriage by friction gearing, sothat the rate of advance is under the control of the operator While themill is running. Another feature provides for retrograding as well asadvancing the saw-carriage by frictiongearing. Another feature providesfor the automatic stoppage of the travel of the saw-earriage in eitherdirection. These features are preferably all embodied in the samesaw-mill; but we clairn each distinct part of our invention separately.

In order that the invention may be clearly understood, we haveillustrated in the annexed drawings, and will proceed to describe, onepractical machine embodying each and every part thereof.

Figure l is a side elevation of the machine. Fig. 2 is a plan view ofthe same minus a portion of the saw-table, broken away to expose thedev-ice below. Fig. 3 is a rear end elevation. Figs. 4. to 7 illustrateportions of the machine in detail. Figs. 6 and 7 are drawn on a largerscale than the other gures. Fig. 8 illustrates a modification of a partof the machine referred to hereinafter.

The same letters of reference indicate identical parts in all thefigures.

The shaft A of the circular saw A isjournaled in bearings on a slidingcarriage, B, mounted on shears of the main frame C of the machine, andcarries a pulley, A2, which is driven by a belt, D2, from the pulley Don the main shaft D, located at the rear end and near the base of themain frame. One side 0f the belt D2 (shown by dotted lines in Fig. l)passes under a pulley, E', the shaft of which is journaled in bearingson the outer end of a swinging frame, E. pivoted on the main shaft I).The other side of belt D2 passes under the pulley F of a belt-tightener,F, which is carried by the swinging frame E, and connected thereto bylinks F2 F2. The outer end of the swinging frame E is connected to thesliding saw-carriage by connecting-rods F2 E2, in the manner shown bestin Fig. I, so that the travel of the carriage will rock the swingingframe, the distance from the axis of pulley E to the axis of thesaw-shaft being practically maintained in all positions of the parts.The length of the swinging frame E is so proportioned with reference tothe greatest travel of the saw-carriage that when the latter is ateither extreme thereof the former projects about horizontally from themain shaft. rIhe swinging frame is partially counterbalanced by aWeighted lever, E2, fulcrumed on the main frame and connected by links eto the outer end of said frame. The saw-carriage is traversed back andforth by an endless chain, G, which travels beneath the carriage,passing around a driving sprocketwheel, G', keyed to a crossshaft, H, atthe rear end of the machine, and around a pulley, G2, at the front endthereof, t-he pulley G2 being j ournaled in ayoke, G, the screw-threadedshank of which passes through a hole in a fixed plate, G4, and isprovided with a nut, G5, for adjusting the yoke to properly stretch theendless chain. 'Ihe saw-carriage has adown- Wardly-proj ecting arm,'B,which is engaged by one ofthe links of chain G, as shown inFig. 4. ShaftH is driven through means of africtionpulley, H', fastened to it.Friction-pulley H is driven alternately in reverse directions by a pairof friction-drivers, I and K, journaled, respectively, on studs I and Kof a lever, L, which is fastened on a roekshaft, L. Ihe rocleshaft L isjournaled in the main frame, and provided With an arm, L2, to which oneen d of aspiralspring, L3, is attached, the other end of said springbeing'attaehed to the main frame. Stud K also carries a pulley, K2, anda spur-wheel, K3. Friction-driver K, pulley K2, and spur-wheel K3 areall fastened together. Spur-wheel K3 meshes With a Spur IOO wheel, I2,fastened to friction-driver I. Pulley K2 is driven by a straight belt,K4, from a pulley D, on the main shaft D,which latter revolves in thedirection indicated by the arrow applied to pulley D in Fig. l, so thatthe friction-driver K will be revolved in the direction required forturning pulley H to retrograde the saw-earriage,whi1e friction-dri verI, revolving in the opposite direction, is adapted to turn pulley H soas to advance the sawcarriage. Spring L3 tends to turn the rockshaft Lso as to throw friction-driver K into driving-contact withfriction-pulley H and friction-driver I out of contact. Frictiondriver Kis of greater diameter than frictiondriver I, so that the saw-carriagewill be retrograded with a speed greater than that with which it isadvanced. lIhe upper end of lever L is connected by a horizontal rod, M,to the upper arm of a vertically-arranged lever, N, the lower arm ofwhich is pivoted to the upright arm of an elbow foot-lever, O, thehorizontal arm of which projects to the front side of the machine, andis provided with a suitable pedal, o. By pressing with his foot onfoot-lever O the operator can rock shaft L against the stress of springL2, so as to release friction-pulley H from friction-driver K and throwfriction-driver I into driving-contact therewith. The travel of thesaw-carriage in either direction is automatically stopped by atappet-gear consisting of a tappet-arm, l?, on the saw-carriage and twotappets, Q and Q', on rod M. The tappets are adjustable'on rod M, sothat the travel of the carriage may be changed at will. The saw-table R,suitably mounted on the main frame, and elevated above the shearsthereof, is provided at the front side with a fence, S, constructed witha suitable loop, s, at a point directly opposite. the sawslot a'. Ascale is marked on the top of the fence to govern the operator incutting off pieces accurately to any desiredlength.

For convenience in cutting off a number of pieces to the same length,the fence is constructed with a T-slot for the reception of a gage, T,which may be adjusted along the said slot, and secured at any desiredpoint by setscrews s', located at different points along the fence. Themain shaft D carries the usual fast and loose pulleys for a belt from aline-shaft. Vhen the main shaft is running, and when there is nopressure on foot-lever O, the sawcarriage will be maintained in itsretrograded position, as shown in Fig. 1, for although spring L:i tendsto throw friction-driver K into driving-contact with friction-pulley H',Afurther retrogression of the saw carriage is stopped by thetappet-gear, which operates -'now antagonistically to the spring L3, andtends to throw friction-driver K out of gear. The saw runs continuously.When it is to be advanced, the operator presses the foot-lever down withhis foot, the effect of which is to throw friction-driver I intodriving-contact with friction-pulley H. The pressure on the foot-leverbeing maintained, the saw-carriage advances until its tappet-arm Pstrikes tappet Q. and forces rod M back, so as to throw friction-driverI out of gear. If the operator continues pressing on the foot-lever, thesawcarriage will remain at rest; but on withdrawing such pressure thespring L3 will rock shaft L, so as to throw friction-driver K into gear,when the saw-carriage will be retrograded.

It is obvious that the saw-carriage may be started from and stopped atpoints intermediate of the extreme points of its travel as determined bythe tappet-gear by properly working the foot-lever. rIhus the machinecould be operated without the tappet-gear, although it is preferred touse at least so much thereof as will effect an automatic stoppage of thesaw-carriage at the extreme limit of its retrograde movement. The speedof the advance of the saw-carriage can also be governed by properlyworking the foot-lever to suit different kinds of work. By pressing hardon the foot-lever the full speed is obtained in sawing light work. Bypressing on it more lightly the speed may be lessened in consequence ofslippage between the friction-driver I and friction-pulley H in sawingthick lumber.

Many modifications may be made in the details of the machine withoutdeparting from the spirit of the invention. For instance, the spring L?,may be replaced by a reverse-pedal on the foot-lever mechanism, asindicated bydotted lines in Fig. 1. In that case the sawcarriage wouldremain at rest as long as neither foot-lever is depressed, and would bead- IOO vanced or retrograded according as one or the other of thefoot-levers is depressed. Instead of the endless chain G, a rack andpinion may be used to traverse the saw-carriage, the rack being securedto the saW- carriage and the pinion to the shaft H, as shown in Fig. 8.One of the rods, E2, may be omitted. The foot-lever O may be replaced bya hand-lever.l

We claim as our vinventioni l. The combination, substantially as beforeset forth, of the saw-carriage, the endless chain connected therewith,the shaft and sprocketwheel and friction-pulley for moving the chain,two friction-drivers for `rotating the said friction-pulley alternatelyin reverse directions, the lever carrying the friction-drivers, and thefoot-lever connected with said lever.

2. The combination, substantially as before set forth, of thesaw-carriage, the endless chain connected therewith, the shaft andsprocketwheel and friction-pulley for moving the chain, twofriction-drivers for rotating the said friction-pulley alternately inreverse directions, the lever carrying the friction-drivers, the springfor turning the lever in one direction, and the foot-lever for turningit in the other direction. p

3. The combination, substantially as before set forth, of thesaw-carriage, the endless chain connected therewith, the shaft andsprocketwheel and friction pulley for moving the In testimony whereof Weaffix our signatures chain, two friction-drivers for rotating the inpresence of tWo Witnesses. said friction-pulley alternately in reverseclirections7 the lever carrying the said friction- WILLIAM H. DOANE.

5 drivers, the spring for turning the said lever GEORGE W. BIUGBEE.

in one direction, the foot-lever for turning,` it in the otherdirection, and the tappet-gear for Vitnesses: automatically turning thelever carrying the A. M. NEWKIRK, friction-drivers to n middle positionto throw A. O. BLAKnMoRn.

1o both seid frictiondrivers out of ger.

